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Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)

To: Martin Josefsson <gandalf@xxxxxxxxxxxxxx>
Subject: Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)
From: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>
Date: Sun, 5 Dec 2004 18:58:17 +0100
Cc: Scott Feldman <sfeldma@xxxxxxxxx>, jamal <hadi@xxxxxxxxxx>, Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, P@xxxxxxxxxxxxxx, mellia@xxxxxxxxxxxxxxxxxxxx, e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
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On Sun, Dec 05, 2004 at 05:48:34PM +0100, Martin Josefsson wrote:

> I tried using both ports on the 82546GB nic.
>         delay        nodelay
> 1CPU    1.95 Mpps    1.76 Mpps
> 2CPU    1.60 Mpps    1.44 Mpps

I get:

        delay           nodelay
1CPU    1837356         1837330
2CPU    2035060         1947424

So in your case using 2 CPUs degrades performance, in my case it
increases it.  And TDT delaying/coalescing only improves performance
when using 2 CPUs, and even then only slightly (and only for <= 62B


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